[Openexr-devel] luts

[Ken McGaugh]

Drew Hess wrote:
> If you have a programmable GPU available with support for 16-bit FP
> pixels, you can do a neat trick with a Cg shader and a 16-bit lookup
> table.  Assuming you can bake your tonemap into the table and you have the
> right hardware, this is pretty fast.
>
> I've attached the Cg shader that does this.


I'm now need to use luts in my fragment shader, and I
think this pack_2half/unpack_4ubyte trick is very cool.  But
my fragment shaders are arbfp1 instead of fp30 (for portability).
Is there anyway to do the same thing using arbfp1?

Thanks.
--Ken